#AI app stacks

Promptfoo vs DeepEval vs Ragas: the TypeScript reality check for Next.js RAG apps (2026)

Promptfoo, DeepEval and Ragas are the three most-recommended open-source LLM evaluation frameworks. For a TypeScript team the first question is which of them you can actually run. We checked the registries in August 2026, and the usual answer is out of date.